Question

已解决：更改了c ==接受（...到c =接受（... 当==使用不当时，应该使用-Wall来查看警告。

我配置syslog连接开放

openlog("program", LOG_PID, LOG_USER);

服务器代码：

for (;;) {
    syslog(LOG_NOTICE, "before accept");
    if ((c == accept(s, (struct sockaddr *)&sa, &b)) == -1) {
        syslog(LOG_ERR, "could not accept on socket");
        exit(1);
    }
    syslog(LOG_NOTICE, "after accept");
    pid = fork();
    if (pid < 0) {
        syslog(LOG_ERR, "could not fork to handle client session");
        exit(1);
    } else if (0 == pid) {
        close(s);
        handle_client(c);
        exit(0);
        syslog(LOG_ERR, "exit after");
    } else
        close(c);
}

然后我使用telnet连接

telnet localhost 2345
...
Connection closed by foreign host.

日志 /var/log/user.log 显示

...some_info...: client was handled
...some_info...: client was handled
...some_info...: before accept
...some_info...: after accept
...some_info...: before accept
...some_info...: after accept
...some_info...: client was handled

看起来rsyslog以随机顺序多次记录消息，虽然我知道我只打过一次telnet。我清楚地理解程序是如何执行的，但是不明白为什么rsyslog会记录多次。

你能否建议如何解决这个＆＃34; bug＆＃34;？

Answer 1

这是一个错误：

if ((c == accept(s, (struct sockaddr *)&sa, &b)) == -1) {

c永远不会等于-1。它应该是

if ((c = accept(s, (struct sockaddr *)&sa, &b)) == -1) {

修改

这会对使用c的后续代码产生连锁效应，0只能包含值1或handle_client(c);。

close(c);

和

machine.config

为什么rsyslog多次记录相同的日志

1 个答案: